As a legal requirement: You have to be 18 or older. If you're 18 in a few days or in a few minutes, then please wait until you are actually 18. This is a strict legal requirement as stated under Section 8 Sub-Section 1 of the Terms of Service.

Due to a slight change in the rules, if you later reveal that you were under 18 at the time of registering and were under 18 on the 1st January 2020 you will be banned for presenting fraudulent information under the same sub-section.